This is very important!!!Error 1604 when Restoring your iPhone v1.1.2 to v1.1.1

[Prolevelz]

This is the Common error when restoring v1.1.2 to v1.1.1 (when loading Firmware v1.1.1)


Note: There are some Reasons for that!!! ( i have encountered it many times)


Issue or symptom

   When trying to restore your iPhone in iTunes, you may see the following error message:     The iPhone could not be restored. An unknown error occurred. Error 1604 Products affected

• iPhone  
  
• iTunes 7.4.3 and earlier  

Solution

  Update to iTunes 7.5 or later.
    If upgrading to iTunes 7.5 or later does not resolve, follow the following troubleshooting steps:
   Restart your computer

   Simply restarting your Mac or Windows PC may allow you to successfully restore your iPhone.
   Try a different USB port

  Connect iPhone to a different USB port on your Mac or Windows PC. USB 2.0 ports that are built-in to the computer are preferred. If your computer has front and rear USB ports, try a port on the other side of the computer. After doing this, attempt to restore your iPhone in iTunes.
    Remove extra USB devices

  Remove all USB devices except the keyboard, mouse, and the iPhone. Connect the iPhone directly to the supplied USB cable, bypassing the iPhone Dock. Remove all USB hubs and connect directly to the computer.
   Try restoring on a different computer

  Attempt to restore on a different computer.  Ensure that the computer you are restoring on has USB 2.0 ports.  
    Create a new user account and restore

 Create a new user account and then restore iPhone.
    Use the steps below if you're not sure how to create a new user. After creating the new user, log in to that account, open iTunes, and determine whether the issue you were experiencing persists in this new user.
     Windows Vista and Windows XP

• From the Start menu, choose Control Panel.
  
• Open User Accounts.
  
• Select Create a new account and follow the instructions to complete the account setup process.
  
• Once the new account is created, choose Log Off from the Start menu.
  
• Log in to the newly created user account.

Mac OS X

• Choose Apple menu > System Preferences.
  
• Choose View > Accounts.
  
• Click the "+" (you may need to authenticate to be able to click this).
  
• Give the new user a name and short name and enter a password.
  
• Select the checkbox for "Allow user to administer this computer". This makes the user an administrator user.
  
• Click Create Account.

Other Options to solve


        Don't Uninstall and Reinstall iTunes!!!  Most of the instructions           found i told me to do that, I never had to.

• If iTunes is open, shut it down
  
• Connect your iPhone to your computer via the supplied USB cable.
  
• Open up Windows Explorer and navigate to the following directory.C:\Documents and Settings\**YOUR USERNAME HERE**\Application Data\Apple Computer\iTunes\iPhone Software Updates. Be sure to replace your username with the appropriate directory. If you can't find the Apple Computer\iTunes folder, you are probably in the wrong users directory.
  
• If you've received the 1604 error, you would have already downloaded the iPhone 1.1.1 update. There should be a 150Mb file in the iPhone Software Updates folder that contains the update.
  
• Double click that file.  iTunes will open, and it should begin the process of updating your iPhone into working condition

Remeber this are my Proven solutions!!! Do it at your own risk!!! But i have Unlocked just a while ago 2pcs iPhone v1.1.2 (Serial no. 7xx46J1xxH8 and serial no. 8xx47PYxxH8)with this solutions!

P.s.  my proven itunes version is 7.5 i guess 7.6 will have some errors in jailbreaking to v1.1.2...But 7.5 was smooth for me!!!

[Prolevelz]

if still wont work

i advice you to use other PC then Install itunes Version 7.5
and create a new user account in the control panel named it iPhone!!!( very Proven for me!!!)